The best replacement for 93 is 87 octane.

The best alternatives to 93 are rated as following:
★★★★★  87 octane
★★★★  91 octane
★★★  95
★★★  92 octane
★★  united 93
★★  87
★★  95 octane
★★  e85
★★  flight 93
★★  95 unleaded petrol
★  95 unleaded
★  89 octane
★  103
★  91
★  87 gas
★  world trade center
  95 petrol
  bdp 95
  bdp-95
  83
  code 39
  cem250 93
  bdp 103
  united 93 movie
  bdp-83
  91 gas
  100 octane
  hp 95
  cem250\/93
  oppo 103

Your alternative for 93 is not listed? Suggest!
Speaking about 93, one probably shouldn't forget about e85.

Other search terms related to 93 and their ratings are:
★★★★★ e85
★ 87
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Google Trends

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93
87 octane
91 octane